Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2fa7e23e7bd5a48…

MALICIOUS

PDF

71.0 KB Created: 2021-09-04 23:45:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc2156ec2caf848e20f98a8665203349 SHA-1: b458831f19ef3246c394b37ca293cf3aad7e339e SHA-256: f2fa7e23e7bd5a4820edbbcf9ec4b3302fab57d52b1f132f6c2ac4ad1b3bb44e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised websites or disposable hosting, suggesting it functions as a link farm. The primary purpose appears to be directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210719104404.pdf In PDF document text
    • http://soul-program.com/clients/e/e8/e84723a0d254fbc5507aaa4bd1967541/File/77353288174.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/90120614661.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/88217091483.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/619206fb05341c0eaa5b56d5f5685d76/buwanakaw.pdfIn PDF document text
    • http://odessahighschool1970.com/clients/7/70/70263b1be1b93b62200e198143f59f20/File/6508449633.pdfIn PDF document text
    • http://poorclarescork.ie/images/fisofumiramowotugukipomi.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607670c4be3cb---6632738324.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/2231206760.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/gexolobamigadovepixawas.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a12318778d---92757434133.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/bt1h4qd2rnk67nqomdggtfn5b1/86021436805.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/e9e6698059bd2954d045e06afb1dbbdc/witaxunodavifatesafalibi.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///98581771489.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fd8d557952---waxifitijukenu.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/40117041126.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/8002119180.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/74fcb7cb7ca4094246992ad20baba8c2/bixubuxadinuliluvo.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/nedesejigogavimamuxe.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e10d04b2bb---befusolujutad.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/vovadomi.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/50215399183.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=estimating+customary+measurement+worksheetsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB618 15348 bytes
SHA-256: 78718ffa1d257c104e240763a86895d1e7e866f22ba1dd7aa79522d7500d8058
font_01_sfnt_off0000dcae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCAE 11004 bytes
SHA-256: ff5858e37f4e65e21cb3bc81a620e9c2028c1a0996dfca6a25d336c6fafb334d
font_02_sfnt_off0000f630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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